# -*- coding: utf-8 -*-
x = int(input())

if x >= 30:
  print('Yes')
else:
  print('No') x = int(input()) x int(input()) int input() input if x >= 30:
  print('Yes')
else:
  print('No') x >= 30 x 30 print('Yes') print 'Yes' print('No') print 'No' x = int(input()) int(input()) x
# -*- coding: utf-8 -*-
x = int(input())

if x >= 30:
  print('Yes')
else:
  print('No')
